Acids and bases pH value

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1.
They turn the yellow litmus paper yellow/red/pink
2.
They taste bitter
3.
They turn the yellow litmus paper green/blue/purple
4.
They are used to test if a substance is acidic or basic
5.
The measure of how acidic or basic a substance is
6.
The ph range of 1-6
7.
The ph range of 8-14
8.
The ph range of 7